Follow up to Bill's point. For Micros I've installed a disconnect on the roof, but never a breaker or fuse Why install a breaker?
jay peltz power On Apr 29, 2014, at 9:43 AM, Bill Hoffer wrote: > Dave > > I agree, in the case of microinverters, you already have a main PV System > disconnect at the Load Panel to shut down the system that is readily > accesible. I would consider the disconnect on the roof as a supplemental > disconnect for the purposes of maintenance by authorized personal that only > needs to be accessible. > > Bill > > > On Tue, Apr 29, 2014 at 8:44 AM, Dave Click <davecl...@fsec.ucf.edu> wrote: > I think 240.24(A)(4) allows the installation of the inverter OCPDs in the > SolaDeck hidden under a module. > > 240.24 Location in or on Premises. > (A) Accessibility. Overcurrent devices shall be readily accessible and shall > be installed so that the center of the grip of the operating handle of the > switch or circuit breaker, when in its highest position, is not more than 2.0 > m (6 ft 7 in.) above the floor or working platform, unless one of the > following applies: > ... > (4) For overcurrent devices adjacent to utilization equipment that they > supply, access shall be permitted to be by portable means. > > > And if panelboards / fused safety switches are allowed to have screwed-down > covers over the OCPDs, I'd think that installing a removable module over > these OCPDs would meet NEC. I guess an AHJ could argue that this requires TWO > covers be removed, unlike a panelboard or a switch. > > DKC > > > On 2014/4/29, 11:15, Jason Szumlanski wrote: >> 690.9(D) is not applicable to the original discussion because we were >> talking about an Inverter output circuit, not a PV Source or Output circuit. >> >> 690.34 may apply if you call a SolaDeck with breakers a junction box, but I >> can see that being a stretch in the mind of many. >> >> My and Ray's question about the screws on the SolaDeck cover itself >> requiring a tool to render it accessible is still an issue if the breakers >> themselves need to be "readily accessible," but that would also apply to a >> Midnite MNPV, which also has a cover with a screw. >> >> >> Jason Szumlanski >> >> >> On 4/28/2014 5:57 PM, Bill Brooks wrote: >>> Read 690.9(D) and 690.34. Not sure where this “hysteria—run for the border” >>> sentiment is coming from. >>> >>> >>> 690.9(D) Photovoltaic Source and Output Circuits. Listed PV >>> >>> overcurrent devices shall be required to provide overcurrent >>> >>> protection in PV source and output circuits. The overcurrent >>> >>> devices shall be accessible but shall not be required to >>> >>> be readily accessible. >>> >>> >>> 690.34 Access to Boxes. Junction, pull, and outlet boxes >>> >>> located behind modules or panels shall be so installed that >>> >>> the wiring contained in them can be rendered accessible >>> >>> directly or by displacement of a module(s) or panel(s) secured >>> >>> by removable fasteners and connected by a flexible >>> >>> wiring system. >>> >>> >>> This is not a change. Please help me understand the concern. >>> >>> >>> Bill Brooks. >>> >>> >>> >>> From: re-wrenches-boun...@lists.re-wrenches.org >>> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Ray Walters >>> Sent: Monday, April 28, 2014 2:23 PM >>> To: RE-wrenches >>> Subject: Re: [RE-wrenches] (no subject) >>> >>> >>> Interesting so does "require a tool" include taking a screw off the cover >>> plate of the combiner box, too? >>> What a game changer. I'm going to Mexico for my next project; I'll >>> actually enjoy even more being the sole AHJ on the project. >>> >>> R.Ray Walters >>> CTO, Solarray, Inc >>> Nabcep Certified PV Installer, >>> Licensed Master Electrician >>> Solar Design Engineer >>> 303 505-8760 >>> On 4/28/2014 2:52 PM, Michael Morningstar wrote: >>> >>> Readily accessible is now defined in the 2014 NEC. Installing OCPD’s >>> underneath a module is a major faux paux, and I can’t imagine any AHJ >>> thinking otherwise. Having to remove a module in order to reset a breaker, >>> what a drag. >>> >>> >>> "Capable of being reached quickly for operation, renewal or inspection >>> without requiring those concerned to use a tool, to climb over, remove >>> obstacle or other.” >>> >>> >>> Michael >>> >>> >>> >>> >>> >>> >>> >>> On Apr 28, 2014, at 10:29 AM, William Miller <will...@millersolar.com> >>> wrote: >>> >>> >>> >>> You call it a solar panel, I call it a glass j-box cover plate. >>> >>> William >>> >>> Miller Solar >>> >>> >>> On Apr 28, 2014, at 9:21 AM, Jason Szumlanski <ja...@fafcosolar.com> wrote: >>> >>> If that is the interpretation, >>> I don't see how the breakers are "readily accessible" in a SolaDeck >>> mounted anywhere, regardless of whether it is under a module. It >>> requires removal of four screws (using a tool) to access the breakers >>> inside the enclosure. It's all up to the AHJ. It has not been an issue >>> locally here. I can see how other jurisdictions may not >>> concur. >>> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> >> >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > > > > -- > William Hoffer > 161 SE Fourth Ave > P.O. Box 1823 > White Salmon, WA 98672-1823 > suneng...@gmail.com > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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